Chrome: Keyboard shortcuts for mouseless browsing are plentiful in Chrome, but if you're looking for a little customization, then Keyboard-fu is an extension that allows you to do just about anything you can imagine.

By default, Keyboard-fu lets you customize anything you want provided you're willing to mess around with javascript a little. Within that, you can create keyboard shortcuts to work only on specific pages, or globally. It is a bit complicated to set everything up, but thankfully Keyboard-fu's internal documentation is enough to at least get you started. You can define all your actions in the extension's settings panel, including setting up new hotkeys, URL filters, and the code you want to execute.